OK MY 97 jetta was spewing oil from above the filter [I changed the oil cooler o-ring refilled the oil [put new oil filter as well] cranked the car and the oil light came on. Checked the oil level and discovered antifreeze mixed in the oil. Is it a blown head or possible that d/t oil cooler o-ring failure that it leaked into the engine? Should I flush out oil and change filter again or am I doomed with a major repair job? Thanks,April in nc